diff -r c04402373720 openide.text/src/org/openide/text/CloneableEditor.java
--- a/openide.text/src/org/openide/text/CloneableEditor.java	Mon Aug 25 12:46:43 2008 +0200
+++ b/openide.text/src/org/openide/text/CloneableEditor.java	Mon Aug 25 14:24:53 2008 +0200
@@ -252,6 +252,11 @@
                     break;
                 }
             case 1:
+                if (CloneableEditor.this.pane != this.tmp) {
+                    // quit when the editor pane was closed in the meantime
+                    phase = Integer.MAX_VALUE;
+                    break;
+                }
                 initVisual();
                 if (newInitialize()) {
                     task.schedule(1000);